Seat-back spring.



L. A. YOUNG.

SEAT BACK SPRING.

ICATION FILED 1,192,868, I 1 Patented July 25,1916.

r @1 @5 @D/ a Hy T UNITED STATES LEONARD A. round, or HIGHLAND PARK, mcnrenn;

SEAT IBACK SPRING.

Specification of Letters Patent. Patented July 25, 1916.

Application filed January 8, 1916. Serial No. 70,893.

To all whom it may concern:

, Be it known that I, LEONARD A. Y 0U1-re, a citizen of the United States, residing at Highland Park, county 'of Wayne, State of Michigan, have invented a certam new and useful Improvement in Seat-Back Springs, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification. v

This invention relates to seat back springs and comprises an improved seat back sprlng in which the arches are constructed of wavy wire and are connected in pairs so that one arch of a pair is arranged to help resist stresses put upon the other arch of the pair.

Another feature of construction is the mounting of the zig-zag or wavy wire arches in such a way that they can be subjected to unusual, stresses without liability of being broken.

.These features will more fully appear in the detailed description following.

In the drawings,Figure 1 is a front elevation of the seat back spring with some of the parts omitted to show the structure to the rear thereof. Fig. 2 is a vertical see tion showing indotted lines how one arch of a pair assists the other arch. Fig. 3 is a detail of a pair of the arches. Fig. 4 isa detail showing the action at the to of the seat back spring. 'Fig. 5 is a etail showing how the top of the seat back spring can be subjected to unusual stresses without injury to the arches.

In the construction of seat back springs,

especially those employing wavy wire. or

, zig-zag wire arches, it has been .foundthat the arches frequently break, leaving-sharp ends which often, protrude through the upholstering and injure it. This is due to the fact that no provision is made to protect the archesfrom unusual stresses. It is the object of. the construction of spring to obviate this trouble. a indicates a base frame rovided with. suitable cross bars I), here s own as channel bars, to carry the helical springs 0. Two horizontal rows of springs are shown although obviously this arrangement can be varied without aifecting the gist of the invention. The front structure of the seat this seat' back back spring comprises a plurality of elongated heart-shape wire units 03, each comprising a single wire, one end of which is clamped into the channel bar at the bottom of the base frame a, which then runs upwardly over the helical springs and is twice loope at the top, the connecting run of wire between the two loops being looped over the top coil of the adjacent helical spring to connect the unit to the helical springs. The single wire then continues back down over. the helical springs and its other end is clamped into the bottom channel bar of the base frame a. The upright runs of wire of each unit are clamped to the top coil of each helical spring 0 atthe sides by small clips.

Each wire unit is surmounted by a pair of wavy wire or zig-zag arches 9 formed in onecomplete arch unit by a connecting run of wire 6 at the forward end of each pair of a'rches (see Fig. 3). -The purpose of making-two arches of one integral piece of wire is the lowering of the manufacturing'cost and the further important reason that one arch of a pair assists its companion arch in resisting stresses brought upon the companion arch. This is shown in Fig. 2. If one arch is subjected to a heavy stress so as to depress it as shown in the lower dotted lines of Fig. 2, it will be found the companion arch will depress as shown in the upper dotted lines of this figure. Hence it is evident that the companion arch assists the first mentioned archin resisting this stress and clamped over the tops of the loops of they The strain on the arch subwire units d and the top frontborder wire of the .front' structure of the seat back spring. Hence the arches-are free to pivot on their front ends as distinguished from the action heretofore incident to spring structures of this type, for it has been customary to either rigidly connect the front ends of the arches to the front structure or else to continue the wire which 'forms the arches down over the helical springs to form part of the front structure. In the last mentioned forms of construction if the wire arches are subjected to such strains as folclips h which secure the rear ends of the arch wires to the top border wire 21 of the base frame 01.

What I claim is:

1. In a seat back spring, the combination of a base frame, a front structure, a plurality of helical springs connecting the front structure and the base frame, the said front structure including wire units having loops at the top, a plurality of zig-zag wire arches connecting the said loops of the wire units with the top of the base frame, and clips for hingedly connecting the forward ends of the zig-zag wire arches with the tops of said loos.

2. In a seat back spring, the combination of a base frame, a front structure including wire units having loops at the tops, helical springs connecting the front structure and the base frame, a plurality of zig-zag Wire arches connecting the tops of said loops and the top of the base frame, and saidfront structure including also a border wire running along the tops of said loops of the wire units, the said forward ends of the said arches being connected with the border wire and the tops of the loops of the wire units in hinging relation.

the said arches, the border wire and the .tops

of the loops, and arranged to hold the forlation.

4. In a seat back spring, the combination of a base frame, a front structure including a plurality of wire units, each having two loops at its top, a plurality of spring arches connecting the tops of the said loops with the top of the base frame, the said arches being arranged in pairs, each pair being constructed of one piece of wire having a connecting run at the forward end, and means for hingedly connecting each pair of arches with each pair of loops of a wire unit.

5. In a seat back spring, the combination of a base frame, a front structure, a plurality of-helical springs connecting the front structure and the base frame, a plurality of arch springs disposed in substantially vertical planes and in parallel relation and formed in pairs, each member of a pair being integrally connected at the front by connecting runs of wire substantially perpendicular to the arches, and loose clips for engaging aboutthe connecting runs of wire and parts of the front structure for hinging the arch springs thereto. a

In testimony whereof, I sign this specification.

LEONARD A. YOUNG.

ward ends of the Wire arches in hinging re- 

